Tool-grinder.



H. G. 'ELVERS.

TOOL GRINDER. APPLICATION FILED JUNE 27/1914. 1,121,995. Patented Dec.22, 1914.

4 SHEETSSHEET 1.

. "Ilium I M [Illllll LO Y7 "l f7aaera J01 il 706 67.350571? u. 0.ELVERS.

TOOL GRINDER;

APPLICATION FILED JUNE Z7, 1914.

Patented Dec. 22, 1914.

4 SHEBTS-SHEET 2.

H. 0. ELVERS.

TOOL GRINDER. APPLIGATION FILED JUNE '27, 1914.

Patented Dec. 22, 1914.

4 SHEETS-SHBET 3.

H. 0'. ELVERS.

TOOL GRINDER.

APPLIOATIONTILED JUNE 27,1914. I 1,121,995. Patented Dec. 22, 1914.

B 4 SHEETSSHEET4.

' To all whom it may concern UNITED STATES PATENT OFFICE.

- Him 0.. ELvEns, or MADISON, wIscoNsIN, ASSIGNOR r eIsnoLr MACHINE Icomramr, or usmson, WISCONSIN, A. oonronnrron or WISCONSIN.

woonenmnnn.

Be it known that I, HANS C..ELVERB,"&

'citizen of the United States, residing .at

Madison, in the county of Dane and State of Wisconsin, have inventedcertain new and useful Improvements in Tool-Grinders,

of which the following is a specification. v

This invention relates "to improvements in tool grinding machines, andhas reference more particularly to improvements in that class of grindinmachines that are adapted to sharpen meta working tools em loye'd onlathes, boring mills and other'mac ine shop tools. I

" Among the objects of the invention are,

making it adjustable to the decreasing size of the emery wheelas-thelatter wears down,

to provide a novel attachment for the tool holder to facilitate thegrinding of broad facing cutters and'which shall have an op eratingmechanism of its own adapted to be actuated when the regular tool holderis locked in a stationary position, to provide a novel one-piece orintegral frame and basin or pan, to provide a novel means'for lockingthe. tool holder in stationary position when it is desired to grind'flator broad facing cutters by the attachment above referred to,

to provide means for oscillating the tool holder either manually or bypower across tical'section, of the complete-machine; Fig.

.the face of the emery wheel, and to rovide means for adjusting the;position on; tool held in the-tool holder'wi'th'relation to the emerywheel in a direction at right angles to the horizontal pivotal axis ofthe tool holder support. 1 f

Other minor objects and advantages of the invention will be apparent"from the following detailed description, taken in con nection withtheaccompanying drawings,

Figure 1 is a side elevation, partly in ver- 2 isl-a fragmentary sideelevation illustrating the sectional and adjustable character of thehood of" the emery wheel; Fig. 3 is a front elevation, partly invertical section, of

the complete machine; Fig. 4 is a horizontal section substantially inthe plane of the stationary tubular arm on; which the tool holder.carriage isTmounted-for oscillation crosswise of the faoe'of-theemerywheel;

' lug block and adjustably' keyed by a set'scr'ew. r 27. To the forwardedge of the adjustable I V Fig. 5 is an enlarged detail view, partly, inelevation and partly in vertical section, on the line 55 of Fig. 7,showing the means for locking 'the hand lever by which the tool 4 4Specification of Letters fatent. Patgnted Dec. 22, 1914. n pusauon amJune 27, 1914. Serial No. 847,592.

holder is oscillated either to the frame of the machine or to a poweroperated lever;

- Fig. '6 is a detail view of the same mechanism in horizontal sectionon the line 66 ofFig. Fig. 7 is a detail view of thesame mechanism,artly in sideelevation and partly in ver ical section; Fig. 8 is an end'-elevat 1on of the tool holder attachment for grinding broad facingcutters, and Fig. 9 is a top plan View of the attachmentshown in Fig.8.'

' Referring to the drawings, the frame of the machine is preferablyformed in a single cast ng and comprises the base plate 10, a

column 11 risin from the rear of the base plate, and abasm 0r pan 12risin from the front portion of the base plate; n the upper end of thecolumn 11 is suitably jour naled a spindle 13,- on one end of which issecured the usual cu -'sha ed em'ery wheel 14. In the lower portion 0 Ithe column 11 is journaled a driving shaft 15 carrying fast andloosepulleys' 16 and 17, and a transmission pulley 18 connected by abelt 19 ex tending-through the hollow column-11 to a pulley 20'fast onthe spindle 13.

5 Surrounding and inclosin the periphery and rear side ofthe emery w eel14 is a two'- part adjustable hood, the same comprising astationary-section 21. securedto the bearing block of the spindle 13 andcovering-the rear side and rear portion of the circumfer' ence'ofthe-emery-wheel, and an adjustable [section 22 covering the forwardperipheral portion of the emery wheel and o si flicient diameter'totelescope over the stationary sec}.

tion 2'1. The adjustable section 22 is sup orted by an arm'23 to whichit is secured y a lug-24 and'set screw 25,the rear end of said arm beingadjusta'bly mounted in a 26' on ,the side of the spindle bearing hoodsection 22 is hinged, the cover plate 28 which guards 'the working faceof. the emery wheel opposite that portion, engaged by the tool in thegrinding operation.-

the hood section 22 can be adjusted rear-- wardly overthe section 21 soas to make the total width of the. hood conform at'all timessubstantially to that of the emery wheel. One advantage 1 of thisconstruction grows out of the fact that the water supply nozzle 29 isusually mounted on the forward edge of the hood, and by maintaining asubstantially constant relation of the forward edge of the hood to {thegrinding edge of the wheel the water jetis-most efiectively dicured vwithin the frame anQg b i the p machine. This hollow s or Q prises a rearportion 37 (Fig. .1) duced portion 38, an annular shoulder-.39

being formed on the junction of the. two portions. The rocking plate 34is secured:

in adjustedposition by a cla'mpflstud 40 (Fig. 1) entering one sideof-Tthesaddle frame 86 and passing through aslotted segment bar 41 faston the rocking plate-.34.

The saddle frame 36 is formed 351$) inner end with a split collar 42that embraces the larger section 37 of the supporting arm, and it isformed at its forward end with a similar split collar 43' that embracesthe reduced inner end of a tubular stem member 44 that is slidablymounted in a hole in the front slide of the basin 12 and itself ismovable endwise on the reduced portion 38 of the hollow tool holdersupporting arm. The bearin collar 43 is confined on the inner end o thestem member 44 by a nutf45. Journaled in the outer end ofthe. stemmember44 is a shaft 46 having a threaded portion extending axially of the stemmember 44 and engaging a nut 47 secured to the for-' ward end of thetubular arm section 38. On

the outer end of the shaft 46 is a hand wheel 48, by 'turning whichthe'stem member 44 and the tool carrier connected thereto is adjusted toand fro from the grinding face of the emery wheel in the direction ofthe axis of the latter. Secured to the inner wall of the basin '12 arecrescent-shaped shields 49 and 50 that extend through arc-shaped slotsin the forward-end and rear ends of the base plate of-the saddlefraine.36 and serve to protect the bearing's42 and 43 of the latter romthe water and grit'that falls into the basin.

Referrin now more particularly to Fig. 4 and the etail views, Figs. 5, 6and 7, 51

designates. a hand lever journaled at it 1...

vertical position.

, 7) with... which engages a nerend by a hub 52 on the reduced portion38 ofthe tool holder supporting arm, said lever extending through'anopening 53 (Fig. 3) in the side of the basin 12 and. terminating in ahandle 54. The outer portion of lever 51, inwardly of the base of thehandle '54, is somewhat enlarged and suitably chambored to accommodateadjusting and locking enlarged portion of the lever 51 is a horizontallocking bolt 55 formed on. its upper side with a rack 56 and in itsouter side with three notches, consisting of a central notch 57 andnotches 58 and 59 -lying to either side of said central notch (see Fig.5). Journaled in the lever 51 above and at right angles to the lockingbolt 55 is a short shaft 60 (Fig. 7) having formed on its inner end apinion 61 meshing with the rack 56 of the locking bolt and having on itsouter end a vertical operating handle 62. One end of the locking bolt 55hasa reduced and flatteuedextension 63 (Fig. 5) that, when the boltisshot in one directionby turning the handle 62 downwardly to the right,engages a'notch 64 formed in a stationary bracket 65 secured to theouter surface of the basin 12, thereby locking the lever 51 rigid withthe frame of the machine. Slidingly mounted within the handle 54 is aspring-actuated locking pin 66 that, when the locking bolt 55 is shot toany of its three positions, autoinatically engages one of the notches57, 58

for 59 of the locking bolt to lock the latter in its set-position. To adepending extension .52 of the hub 52 oflever 51 is secured by abolt,.l16 a counterweight 117 that substantially balances the toolholder and its assotipped to either side of a 'eiated parts whendesignates another lever arm that is also mounted to rock on the mainsupporting arm 38 by means of a hub 68, the forward end of which leveris formed with a-worm wheel sector 69 (Fig. worm 70 formed on'a verticalshaft 71 journaled in upper and lower'bearings 72 and 73 formed-on thelever 51, the upper end of the shaft 71 having a milled head 74foractuatingthe same.

Throu h. this worm gear mechanism the lever 6 is at all times connectedto the lever devices, as hereinafter described. In a bearing or bedformed in and crosswise of the llILtl) 51, and the lever 67 isitself-connected to the I saddle frame '36 of the tool holder by meansof a short upwardly extending arm 5 (Fig. 7) on the lever 67, a sleeveor-boss 7 6 on the upper end of arm 75, and a pin or rod 77 carriedbyany and slidingly engaging the sleeve 76.

' By means of the worm and worm sector connection between the levers 51and 67 'it is possible to adjust the position of the tool held in thetool holder relatively to the emery wheel in a direction at right anglesto the axis of the main supporting arm 38,

the saddle frame 36 and pivot- {Which is llite "desirable; whereteas-tat to be roun that .wheli clamped in theteol hol er, projectvarying distances or. at varying angles from the face of the latter-Sofar as I ani aware, in-grindihg ma chines of this character noprovision has ever been made for' power operation of the tool holder. Inthe present machine I have incorporateda mechanism by which the toolholder can heoperated eithermanlial-ly or from the same power shaft bywhich the spindle and emery. wh'eela're'driven, and this mechanism willnow be described.

Referring firstto Fig. 4-, 78 and 79 designate two arms of a power leverthat are connected at their'inner ends by a bearing ring or hub 80 whichis also journale'd on the main supporting arm 38,- and which lever,

extendsentirely across the basiiiv12 of the -machii1e frame- As will beseen by reference to Fig. 1,- the lever supporting rings or hubs .52and: so. are set sideby side on the arm 38 and are turned downzen theirvinifer or opposing faces "to provide a seat or bearinLgfor thesupporting ring or huh'68 of the lever 67: the entire assembly beihgconfined.

sidewi'se between the shoulder 39 of the sii" portingaarm anda ring .81fastened to 't e desired between zero and the maximum ra-" dius of thediskby the connection shown comprising. an undercut slot 85 extendingcounter shaft 83 that carries the crank disk.

diametrically across the face of the disk, and a wrist-pin 86 on whichthe pitman 110' is mounted and WhlOlfllS adjustable lengthwise of theslot- 85 by a clampiiig bolt 87. Splined on the inner end of the driveshaft 15 is a pinion '88 controlled by a lever 89 pivoted to lthegeareasing-'84 and connected by a link 90-tothe-lower eiid of an arm 91 faston a shaft 92, whichlatter is journaled in a bearing bracket 93 andcarries at its other end an operating handle 94.- By this means thepinion 88 is 'sl'idable into and oiit of engagement with a spur gear 95journal'ed within the gear casing 84;, which spur gear 95 carries apinion 96 that, in. turn, meshes with a spur gear 97 fast on the 82. Bymanual-manipulation of the operating handle 94, therefore, the powerlever 78, 79, 80 can be connected Wlth or disconnected from the powershaft 15.. The other arm 78 of this power lever extends parallel withthe lever arms 51 and 67 through the opening 53 and, at its outer end,is formed with an arc-shaped head 98 in the outeredge. of which isformed a groove 99 (Fig. 4);;

that engages aii arc-shaped tat't'gue 100' sttutttito" th'e itvet 51. fIn e inner side-of the' -h'ead 98 of the lever arm 78 is forhied a notchorhole v101 (Fig. 5) into which the right hand end ofthe locking bolt"55 is shot byswiiiging the handle 62 to the-left, there- 7 by lockinthe lever the 8 to the lever arms 51 and 6 ,f whei'eby the- )"scillatingmove- 1 merits of the tool holder around the supportin arm 38 ma beeffected by power.

F'rornthe foregoing it will be readily 1m.- derstood that when thlocking in 66 engages the central note 57 of t e locking bolt'the latteris in idle-positionfwhen the' lohking pin -66 engages the right handnotch 59, the lever arms 51 and 67 are locked .to go I the fraiiie-fofthe machine; and when the locking 'pin 66 engages the lefthand notch theettertpe ting mechanisms!) as to'b'e It may at hated that the .ptvetievet 78 canbe allowedto oscillate continuoiisly even 'tthefi theopeater is oscillating the tool Home by at-@1554; and thus .11- l he hasto do when he. wishes to connect hp is to t tf tt the handle 62 totheleft and the spring-actuated pin 66 will then force'the lock bolt 55into its seat 101 as-th'e lever oscillates past the .lock.bolt. Asthe'operator is "cons'taiitly engagin and disen aging the poweroscillating m ianism, thfs feahire is quite valuable si' e it makes ituniieeessary to reach over to handle 94 for shifting the" sliding ge'arinand out every time that he wishes to change from manual .58.thele'verfarms '51 and state lockedto the tool holder to the poweroscillating lever v its screws 104. The tool clamp is formed with adovetail'slide'105 on its rearside which 'ehgagesa slideway 106 in aholder 107, being confinedin place by a gib 108. The holder 107 isformed with a stem or shank 109 that is secured in the tool holder headproper 30. on the lower edge of. the tool clamp 102 is a rack .111engaged by a pinion 112 on the lower end of a shaft 113 journaled in avertical bearin 114' on the rear side of the holder 107; an on the upperend of the shaft 113 is ,an operating handle 115. In

using this attachment the same is mounted and forth across the fac'etofthe emery wheel 5y oscillating .the arm ,As show n,'the

pi'xiin 1121s made of tathen igt diameter by its shank 109. in the head30, the latterso that it is only necessary to swing the handle 115through an arc of about 120 degrees.

I claim:

1. In a tool grinder, the combination with an emery wheel, and a toolholder head mounted to oscillate across the face of said emery wheel, ofmeans for locking said tool holder head in stationary position wherebyto adapt the same to receive a manually operated attachment for thegrinding of broad facing cutters and like tools.

2. In a tool grinder, the combination with a column and an emery wheeljou'rnaled in the upper end ofsaid column, of a basin formed integrallywith said column, a hori-- zontal .arm at its outer end projectingthrough and supported by one side of said basin, a tool holder mountedon said arm within said basin, and means for oscillating said toolholder across the face of said emery wheel.

8. In a tool grinder, the combination with a frame and an emery wheeljournaled therein, of a .horizontal arm on said frame, a tool-holdermounted-to-oscillate on said arm, a hand lever pivoted at its inner endon said arm and connected to said tool-holder, and means for lockingsaid hand-lever to the saidframe.

at. In a tool grinder, the combination with a frame and an emery wheeljournaled therein, of a horizontal arm on said frame, a tool holdermounted to oscillate on said arm, ahand lever connected to said toolholder, a locking bolt slidably mounted in said hand lever, a bracketsecured to the frame later- {ally opposite said hand lever and formedwith a socket to receive one end of said locking bolt, and means on saidhand lever for actuatingsaid locking bolt into and out of engagementwith said socket.

5. In a tool grinder, the combination with a frame and an emery wheeljiournaled therein, of a horizontal'arm on said frame, a tool holdermounted to oscillate on said arm, a hand lever connected to said toolholder, a locking bolt slidably mounted in said hand lever and formedwith a rack bar on one side thereof, a bracket secured to the framelaterally opposite said hand lever and formed with a socket to receiveone end of said locking bolt, a pinion journaled in said hand lever andengaging. said rack bar, and means for turning said pinion. V

6. In a tool grinder, the combination with a frame and an emery wheeljournaledtherein, of a horizontal arm on said frame, a tool holdermounted to oscillate on said arm, a hand lever connected to said toolholder, a locking bolt slidably mounted in said hand lever, a bracketsecured tothe frame laterally opposite to said hand lever and formedwith a socket to receive one end of said locking bolt, means on saidhand lever for actu ating said locking bolt into and out of, engagementwith said socket, and means on said hand, lever for securing saidlocking bolt in either locking or released position.

'7. In a tool grinder, the combination with a frame and 'an emery wheeljournaled therein, of a horizontal arm on said frame, a tool holdermounted to oscillate on said arm, a hand lever connected to said toolholder, a locking bolt slidably mounted in said hand lever and formedwith a rack bar on one side thereof, a bracket secured to the framelaterally opposite said hand lever and formed with a socket to receiveone end ofsaid locking bolt, a shaft journaled in said hand lever atright angles to said locking bolt and having a pinion on one endengaging said rack bar, a handle on said shaft for turning the same, Iand means for automatically securing said locking bolt in locking orreleased position.

8. In a tool grinder, the combination with an emery wheel, and a toolholder mounted to oscillate across the face of said emery wheel, of handoperated means for oscillating said tool holder, power operated meansfor oscillating said tool holder, and means for rendering either saidhand operating means or power operating means eflective at the choice ofthe operator.

9. In a toolg'rin'der, the combination with an emery wheel, and a toolholder mounted to oscillate across the face of said emery wheel, of ahand lever for oscillating said tool holder, a power actuated lever for0s cillating said tool holder, anda locking bolt slidably mounted in oneof said levers and adapted to engage and disengage a socket ,in theother whereby to couple said levers together for power operation of thetool holder or to uncouple them for hand operation thereof.

10. In a tool grinder, the combination .with an emery wheel, and a toolholder mounted to oscillate across the face of said emery wheel, of ahand lever for oscillating said tool holder, a power actuated lever foroscillating said tool holder formed with a socket therein, a lockingbolt slidably mounted insaid' hand lever forcOiiperation with saidsocket and formed with a rack bar on oneside thereof, a pinionjournaled'in said hand lever and engaging said rack bar, and means forturning said pinion.

11. In a tool grinder, the combination with a frame and an emery wheeljournaled therein. of a horizontal "arm on said frame,

a tool holder mounted to oscillate on said a socket therein, a bracketsecured to theframe opposite the other side of said hand' lever andformed with a socket, a locking arm, a hand lever connected to said toolbolt slidably mounted in and crosswise of said hand lever, and means foractuating said locking bolt into engagement with said bracket, or withsaid power operated lever, or to an intermediate position wherein it isdisconnected from both.-

12. In a toolgrinder, the' combination with a frame and an emery wheeljournaled ther i of a horizontal arm on said frame, a tool holdermounted to oscillate on said arm, a hand lever connected to said toolholder, a power operated lever pivoted on said frame and extendingsubstantially parallel with said hand lever and formed with asockettherein, abracket secured to the frame opposite the other side of saidhand lever and formed with a socket, a locking bolt slidably mounted inand crosswise of said hand lever, and means for automatically securingsaid locking bolt in any of said three positions.

13. In a tool grinder, the combination with a frame and an emery wheel journaled therein, of a horizontal arm on said frame, a tool holdermounted to oscillate on said arm, a leverpivoted on said arm andconnected to said tool holder, a second lever pivoted on c said arm, andextending alongside said first named lever and terminating in a handle,and means connecting said levers for simultaneous operation, saidconnecting means including mech anism for varying the vertical angleformed between said levers whereby the relative position of the toolholder may be varied with relation to the emery wheel in a direction atright angles to said horizontal arm.-

14:. In a tool grinder, the combination with a frame and an emery wheeljournaled therein, of a horizontal arm on said frame, a tool holdermounted to oscillate on said arm, a lever pivoted on said arm andconnected to said tool holder, a second lever pivoted on said arm andextending alongside said first named lever and terminating in a handle,a worm wheel sector formed.

on one of said levers and a worm journaled in the other lever engagingsaid worm wheel sector, and means for turning sald worm.

HANS o. ELVERS.

Witnesses W. L. MILLER, H. J PARKE.

